Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d53814f398077a…

MALICIOUS

PDF

78.3 KB Created: 2021-08-29 04:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 869f4c8e5a3628054ae191cfd3d45559 SHA-1: 99436c145cb1320ebe1bdc427cb6537dcc2bebbb SHA-256: 86d53814f398077ac06341c7b38e786ceb0b71a0bfdf99e0c9f69eb2f63672aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs pointing to various compromised websites, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple compromised CMS upload links suggests an attempt to host or distribute malicious content through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://alhs1973.com/clients/64426/File/vixewurejevetifuwusubagor.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdba371c5ee---12612775714.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1c654d34ec3fcc68c6832e74848f3c20/77497104436.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/12316419366.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ceec0c73---46559372593.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/8e8656936d4fb6b5a80bd8eb91788360/64990475362.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/toxosizexepusopijozuweber.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1f84a2036---seminejavimat.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/rbobmkilputkbvortb1qhippe3/diletesax.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zovuvugu.pdfIn PDF document text
    • http://teraval.cz/res/file/lamoterusobekujirakefab.pdfIn PDF document text
    • http://yanartextil.com/firma/files/10675811152.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/92285199963.pdfIn PDF document text
    • https://signika.pl/Upload/file/daladuvibapageren.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/47637610868.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ls9jh1s6fmh2hou8pappail7tm/68208492201.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jisosilibolep.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/nofenajoniriwabotikujekiz.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/28869308538.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/57926741813.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/67d4d4334bffeaa3af4cbe508393915e/zasawumipimarejaruremuxak.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113c66c5e7d---87269971921.pdfIn PDF document text
    • http://turnyras.lt/Files/file/99600454267.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/25711369583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=need+for+speed+heat+fastest+muscle+carPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 17160 bytes
SHA-256: 0d1f64475d5f65c3900385906abd97b4d8af06791035f4a71a5bbc843c1c48ad
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 10764 bytes
SHA-256: b9892fa21b18c943fcb880c4370ca636b885517d65884277866efad56946d527

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